After four years of experiencing amenorrhea, Tonya seeks medical care to help her become pregnant. She is convinced that her lack of menstrual periods is the cause of her infertility. Tonya’s height is 5 ft 5 in.; her weight is 107 pounds, which she has maintained for four years (she previously weighed 121 pounds). Her FSH and LH levels are both abnormally low, and she is not ovulating. When the importance and methods of weight gain are explained to her, Tonya agrees to gain some weight. After she regains 7 pounds, her LH level is normal, but her LSH level is still low, and the luteal phase of her cycles is abnormally short. When her weight reaches 119 pounds, Tonya’s LH and FSH levels, ovulation, and menstrual cycles are normal.
Questions
1. Was Tonya underweight or normal weight based on her body mass index (BMI, kg/m2) when she weighed 107 pounds?
To explain: Whether Person T was underweight or normal weight based on her body mass index when she weighed 107 pounds.
Introduction: Body mass index (BMI) is obtained by dividing weight (in kg) by square of height (in m). If the BMI is greater than 18.5, then it is considered underweight. The BMI of 18.5-24.9 comes under normal weight, and people with 25-29.9 are overweight, and people with BMI of 30 and higher have obesity.
Person T is 5 ft 5 in. (1.65 m); her current weight is 107 pounds (48.53 kg) and her previous weight was 121 pounds (54.88 kg). Both her FSH and LH levels are low, and she cannot ovulate. After sometime, she regains 7 pounds and her LH level becomes normal, but her FSH level is still low and the luteal phase of her cycles is abnormally short. When her weight reaches 119 pounds (53.97 kg), her LH and FSH levels, ovulation, and menstrual cycles becomes normal.
The critical level of body fat (usually indicated by a body mass index over 20 kg/m2) is needed to trigger and sustain normal reproductive functions in women. Low levels of body fat during adolescence is related to delays in the onset of menstruation and reduced fertility later in life. Impaired fertility in underweight women often takes the form of delayed time to conception and amenorrhea. Lowered libido and reduced sperm production have been identified in underweight men with low levels of body fat.
The formula for the body mass index is as follows:
Substitute
Person T was underweight when she weighed 107 pounds as her BMI was 17.83.
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)
Cardiopulmonary Anatomy & Physiology
Understanding Nutrition (MindTap Course List)
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Chemistry for Engineering Students
Human Biology (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
Chemistry In Focus
Biology: The Dynamic Science (MindTap Course List)
Inquiry into Physics
College Physics
College Physics
Introduction to General, Organic and Biochemistry
Horizons: Exploring the Universe (MindTap Course List)
Biology (MindTap Course List)
Introductory Chemistry: A Foundation
Chemistry: An Atoms First Approach
An Introduction to Physical Science
Chemistry & Chemical Reactivity
Human Heredity: Principles and Issues (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
Fundamentals of Physical Geography
Chemistry In Focus
Chemistry for Engineering Students
Physical Chemistry
Chemistry: Principles and Reactions
Chemistry for Today: General, Organic, and Biochemistry
General, Organic, and Biological Chemistry
College Physics
Organic Chemistry
Environmental Science (MindTap Course List)
Physics for Scientists and Engineers
Environmental Science (MindTap Course List)
Organic And Biological Chemistry
Oceanography: An Invitation To Marine Science, Loose-leaf Versin
Organic Chemistry
Foundations of Astronomy (MindTap Course List)
Chemistry & Chemical Reactivity
Physics for Scientists and Engineers, Technology Update (No access codes included)
Physics for Scientists and Engineers with Modern Physics
Biology: The Unity and Diversity of Life (MindTap Course List)
Physics for Scientists and Engineers: Foundations and Connections
Introductory Chemistry: An Active Learning Approach